Bob, thanks. The 845 is about the same so believe it is true across the board.
Freelance,
Same year, it is actually only 675 pounds which gives several advantages:
1) Dual propane tanks
2) ~20% larger holding tanks
3) Almost twice the water
4) Shower doesn't drain into black tank
5) A wet bath that is much larger
6) North-South bed (for our non-extended 815)
7) Four more inches of head clearance especially in the cab-over.
8) 60% larger refrigerator
9) Pantry
10) Second drawer under wardrobe
Other things that I will gain when I "upgrade" is electric jacks and an oven.
Except for the bath size, we have been extremely happy with the 815. If it wasn't for the fact we want electric jacks, oven, and larger bath, we would love to stay with the 815. The 915 is as close as we can stay to the 815 yet get what we want.